David Ormsbee 3a552c4fdf feat: Outline error handling and admin improvements. ...

* Introduces the idea of content errors into the learning_sequences
  public API, accessible using get_content_errors().
* Makes course outline generation much more resilient to unusual
  structures (e.g. Section -> Unit with no Sequence in between),
  with the understanding that anything that doesn't conform to the
  standard structure will simply be skipped.
* Improves the Django Admin for learning_sequences to display
  content errors and improve sequence data browsing within a course.
* Switches the main table viewed in the Django admin from
  LearningContext to CourseContext, which is appropriate since only
  course runs generate outlines.

This was done as part of TNL-8057, with the end goal of making
course outline generation resilient enough to switch over apps
to using the learning_sequences outline API. The types of course
structure errors that this PR addresses cause display issues even
in the current Outline Page experience, but would break the outline
generation for learning_sequences altogether.

The approach for error messages here is very generic, to keep
modulestore concepts from seeping into learning_sequences (which is
not aware of the modulestore/contentstore). We may need to address
this later, with a more normalized content error data model.

While the Django admin page is backwards compatible with the old
versions of the models, we should run the backfill_course_outlines
management command after deploying this change, to get the full
benefits.

2021-03-15 01:31:36 -04:00

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